Whistling sound 2005 honda crv?

When accelerating starting to make a whistling sound when i reach 30,000 rpm
When i rev can't go over 50,000 rpm and it start to creat a whistling sound
I change air filter clean the trottle
Still have the problem

Guessing it's a typo with the stated 30,000/50,000 RPM? Was the AC on? My 2007 has the same noise (Guessing) like yours and the dealer replaced the what so called "New/ Improved" expansion valve for the AC system. It took care of the noise.

This is the TSB for my 2007 model, don't know if there's one for 2005 model: Contact your local dealer for more information:

http://techinfo.honda.com/...08-007.PDF

Other things could be electrical interference through the radio from the alternator? (Guessing again) ;-)
or bearing noise from the belt tensioner or alike in the engine compartment? You have not specified where you heard the noise from the exterior or interior. Could it be like a vacuum leak? Window seal(s) leak? Windshield seal leaking? You can tape off around the windshield frame and test drive and see if the noise is gone.

Could it be the roof rack, remove it and see. Could it be any after market thing(s) that installed like bug shield or the air intake has been modified?

Could it be the AC compressor? Look at this link:
http://www.crvownersclub.com/forums/15-recalls-tsbs-notices/2453-cr-v-tsbs-released-04-05-06-07-08-a.html

Don't know for sure if it help you but vehicle noise, any noise is a nightmare to diagnose, specially online. Anyway e mail me and if you would include more information so I can pull out my magic ball and see. HTH

Edit: Good luck to you.

At 30000 rpm any honda engine will be in orbit, even the fastest one only goes to 8000, most likely a vacuum leak or the throttle valve not fully opening